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Basis of Presentation (Details)
member in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
member
State
Segment
Basis Of Presentation [Line Items]  
Number of reportable segments (in segment) | Segment 3
Medicare Acquisition terminated  
Basis Of Presentation [Line Items]  
Termination fee receivable under asset purchase agreement | $ $ 75
Health Plans  
Basis Of Presentation [Line Items]  
Number of States in which company operates (in state) | State 12
Number of members eligible for the health care programs | member 4.2
Minimum contract terms 3 years
Maximum contract terms 4 years